Unique cameo of Calliope

This is a VERY UNIQUE SHELL CAMEO OF CALLIOPE.The shell is cut out and set in a very fancy gold gilt frame.May be Pinchbeck.The size is 2 by 2 3/8.Has a large loop for chain and a pin that looks to be added later in life.From around 1850.Much nicer in person. She has a wonderful hair piece in her hair